B&M pro stick question

When I bought the car back in Feb it came with a th350 and a b&m pro stick shifter. The car shifted from Park, R, N, 3, 2, 1... and The gate plate that is on it is for a three speed, reverse pattern.

I just had a 700r4 put in yesterday, full manual reverse valve body.. and the car shifts Park, R, N, 1, 2, 3.. and I can't shift to 4th because the gate plate will not allow it.
I called B&M and they only make a forward pattern gate plate and not a reverse pattern plate for the 4 speed gate plate.

My question is why does it matter? If the plate that's in there now works before and after the transmission swap, why can't I use the plate for the 4 speed forward pattern?
Thanks for any help in advance.



